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Fit up the. apparatus as shown in Fig. 43. The distilling
flask should have a capacity of not less than i litre, and is
attached to a long condenser. An adapter is fixed to the end~of
the condenser, dipping into a conical flask (250 c.c.)3 which
serves as receiver. The alcohol and sulphuric acid are mixed
in the distilling flask and cooled to the ordinary temperature
under the tap. The potassium bromide, coarsely powdered, is
then added. The flask, which is closed with a cork, is fixed to
the condenser and heated on the sand-bath. A sufficient quan-
tity of water is poured into the receiver to close the end of the
adapter. After a short time the liquid in the flask begins to
boil and froth up, and the ethyl bromide, in the form of heavy

FIG. 43.
drops of colourless liquid, distils and collects at the bottom of
the receiver. If the liquid threatens to froth over, the flask must
be raised from the sand-bath for a moment. The distillation is
continued until no further drops of oil appear at the end of
the condenser. As the ethyl bromide has a low boiling point
(38-39), it is desirable to surround the receiver with ice during
this operation. The distillate is now removed and poured into
a separating funnel (Fig. 44), and the lower layer of ethyl bro-
mide separated. The water is thrown away and the ethyl
bromide poured back together with about an equal bulk of dilute
sodium carbonate solution and shaken up. The ethyl bromide
is withdrawn, as before, and again shaken up with water.
Finally, it is carefully separated from the water and run into a
dry distilling flask. The small quantity of water which remains,